I like Xiàng which is elephant in Chinese or LeXiang combines the Le from Leo and Xiang.
Leophant is cool which i am sure has been said.
See-ang nyan qua-ler (Happy Year of the elephant) Then subeta can be ivory free!!

Trancederm? Trance+ Pachyderm, pronounced "trance-eh-derm"
[tot=Chey]
Probos
From the word "proboscis" and since elephants are from the order Proboscidea.
Yumezou
Yume = dream Zou = elephant
Also, it fits one of the missing letters quite well.
💋 🎶 🌸 Flower Aline 🎃 💖 ToT: Aries
Pachydream. As in a pachyderm and dream, not overly creative but I thought it was cute.
[flower=frizz]
Yunnan (pronounced yoo-nan, -nahn)
There is a rich history of tea trees in China. The Yunnan Province is said to be the homeland of tea treas. There are cloudy mountains there that could symbolize this new pets dreams. Plus, this name starts with a Y :) While doing some research, I came across a Yunnan tea and once I looked into it's history, I thought name was suiting! Definitely worth searching and reading about.
<3 <3
Yaneth came to mind, idk.
I didn't get a chance to read all the suggested names, but here's a couple!
-Tantor
From Tarzan!
-Teator or Tantea
Because I'm not creative with my name combinations. :P
-Yamal or Lyuba
A wooly mammoth calf's remains were found on the Yamal Peninsula. (And it starts with a Y!)
Lyuba is the name of the calf that was found.
-Mamut
Obvious reasons.
-Iroh

SO EXCITING OMG. -spasm-
Hoarding:
2986/??? (turns out I haven't updated in a while. Whoops!)
Thank you anon ;_; x10 March 4/21/21 (RIP Storm-buddy the leopard gecko- you lived a great 16.5 years.)
and everyone who upvoted my initial post, you guys are too sweet in supporting Menghua for this angel of a pet, i cant thank you guys enough ;-;

My suggestions: Quineun, Yasafer and Unduion
[tot=Kat]
Taphacha:Ta-fa-cha Matchari: Mat-cha-ri Oolongphy: Oo-long-fi Yerbadalli: Yer-ba-daly Tusli: Tus-li
I wanted to go with more tea themed names since it mentioned it in the description.
I haven't read through all 24 pages of the topic, so apologies if these have been suggested already!
Phantidae Shortening of 'Elephantidae' Oneiron Greek term for dreams, I believe. Haomeng From 'Sweet Dreams' in Chinese (Pinyin).
Xiassam/Xiasam - a combination of Xiang (Chinese for elephant) and Assam (a type of tea) Omijacha - a type of Korean tea, it means Five Flavor Tea Daejak - a grade of green tea (picked in May and June) in Korea Mengajah - a combination of Meng (dream in Chinese) and Gajah (Malay for elephant) Yumezocha - Yume (dream in Japanese) Zo (elephant in Japanese) and Ocha (tea in Japanese)
Good luck everyone! There are some great suggestions out here!